Repairmaintenancefabrication of trash rack installed on Main Tawi Irrigation Canal for its continuous and smooth operations TR Chawadhi

TR Chawadhi – The job comprises of constructing a temporary bund from gunny/sand bags with the help of lift and manual labour to control the flow of water and deployment of dewatering pump to extract out the stagnant water from the canal so as to make the conditions suitable for extraction of trash rack to carry out the repair work. The job further comprises dismantling of the trash rack by way of cutting the fasteners and subsequently the embedded trash rack with the help of cutter and extraction of the damaged trash Rack segments installed on the Tawi Canal from its grooves with the help of crane and manual labor and other equipments required and further removal of sand bags from the canal and loading them in a load carrier for their disposal at a suitable place along with removal of trash/garbage/debris lying near/on the sides/at the mouth/removing of the bushes across grooves etc. of the siphon and dumping it to a suitable dumping site, cleaning of area and thereafter shifting all the material from the site to the workshop in a load carrier & again unloading it with the help of crane/labour and other tools & tackles required for the execution of the repair works as mentioned below :- Cutting/Dismantling/Dismembering the damaged/corroded/distorted inner vertical strips and frame work members of the upper portion of the trash rack with the help of gas cutter. Providing and fitting of the new trash rack peripheral framework member approx. 06 mtrs. made out of MS Angle 75x75x8 mm in lieu of badly damaged/rusted one. Straightening of the rest of the upper framework member made out of MS Angle with the help of power pressing, hammering etc. Providing and Fabrication of 02 No. inner vertical strips made out of MS flat of 50 x 6 mm in lieu of the badly damaged/corroded/missing ones and MS angle of size 75x75x8 mm , 07 mtrs. in length (top and bottom end combined) welded laterally at both upper and lower ends symmetrically at the centre and one No. vertical central support (1.5 m) made out of welding of 02 No. angles for additional support and resistance of the trash rack against bending/buckling. Straightening of 12 No. inner vertical strips made out of MS flat of 50 x 6 mm. Welding back all the members of the trash rack to form the constituent structure. Welding work is to be carried out using good quality water resistant electrodes, conforming to IS specifications. Grinding and finishing of the welded portions with the help of precision tools in such a way so as to remove blow holes, weld deposits, weld residue, sharp edges etc. Cutting/Dismantling/Dismembering the damaged/corroded/distorted inner vertical strips and frame work members of the lower portion of the trash rack with the help of gas cutter. Providing and fitting of the new trash rack peripheral framework member approx. 08 mtrs. made out of MS Angle 75x75x8 mm in lieu of badly damaged/rusted one. Straightening of the rest of the upper framework member made out of MS Angle with the help of power pressing, hammering etc. Providing and Fabrication of 04 No. inner vertical strips made out of MS flat of 50 x 6 mm in lieu of the badly damaged/corroded/missing ones and MS angle of size 75x75x8 mm , 04 mtrs. in length welded laterally and one No. vertical central support (1.5 mtrs.) made out of welding of 02 No. angles for additional support and resistance of the trash rack against bending/buckling. Straightening of 06 No. inner vertical strips made out of MS flat of 50 x 6 mm. Welding back all the members of the trash rack to form the constituent structure. Welding work is to be carried out using good quality water resistant electrodes, conforming to IS specifications. Grinding and finishing of the welded portions with the help of precision tools in such a way so as to remove blow holes, weld deposits, weld residue, sharp edges etc. Application of two coats of anti corrosive red oxide primer followed by application of two coats of light blue paint. Transportation/loading of trash racks in a private vehicle with the help of crane/labour and transporting the same to the siphon mouth and lowering and installing the trash rack into the grooved channel with the help of crane and manual labour. Providing/ fitting of nuts/ bolts of required size specifications (as per sample) for holding the trash rack firmly/ robustly .The job includes cost of material, labour charges, hire charges of tools & tackles, crane, loading & unloading charges etc. Complete Job